Tooth-filling impression device.



I. W. IVORY.

TOOTH FILLING IMPRESSION DEVICE. APPLICATION vFILED ocT.1, 1915.

l, 182,376. Y Patented May 9, 1916.

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WITNESSES ATTORNEYS JAMES W. IVORY, OF EHILADELPEIA, FENNSYLVANIA.

TTEL-FILLINGr IMPRESSION DEVICE.

Specification of Letters Patent.

Patented May 9, 1916.

y. Application le October?, 1915. Serial No. 54,488.

To all wlw/mf t 01mg/ concer/'i lie known that l, JAMES W. lvonr, a subject of the King of Great Britain, residing in the city and county oic Philadelphia,

State Vof Pennsylvania, have invented a new to be filled, either by an inlay where wax is used as a model :for the subsequent casting, or where thelilling is of a plastic nature, the device being intended to model into the cavity ot the tooth any plastic material or wax models of any inlay material, giving the same a natural contour to the outlines of any wall of the tooth in which such inlay or filling is to be inserted.

rlhe matrix is provided with a holder or kcarrier for the convenient manipulation oi the same.

The invention is satisfactorily illustrated in the accompanying drawing, but the important instrumentalities thereo' may be varied, asy long as r`they'are included in the scope of the claims. l l

Figure 1 represents a perspective view oi' a tooth-filling matrix device embodying my invention. Fig. @represents a perspective view Vof the matrix member thereoi". Fig. 8 represents a vertical sectionof a portion on the line m-:r Fig. 4i. Fig. l represents a horizontal section oi a portion on the line g/-a/ Figl. Fig. 5 represents a perspective View of the matrix 'member in normal condition. Figs. 6, 7 and 9 represent diii'erent forms oi' carriers that may be employed for the matrix member. Fig. 8 represents the matrix held in operative position.

Similar numerals 0I" l reference vindicate corresponding parts in the figures.

Referring to the drawings, 1 designates a matrix which is formed of a band piece or body of sheet metal or other suitable material and composed of the front wall 2, the side walls 3, the top wall or tip 4, and the outturned tongues 5 on the terminals of the side walls 3.

6 designates a carrier for the matrix, the same being composed of the side arms 7 forming a bifurcation and the handle 8 which are connected with Said arms 7, the

latter having therein the slots 9 which are adapted to receive the tongues 5 of the matrix. @n said arms are the slides or catches lO which are connected with the same by means ci the screws 1l which pass through longitudinally-extending slots 12 in said catches andare secured to said arms. @n the forward ends of said catches are the inwardly-extending lips 13, it being noticed that when the tongues of the matrix are .fitted in the rslots 9 they are bent forward therefrom, as most plainly shown in 1 and Li, when the catches are moved toward said tongues, and the lips 18 introduced into the slots 9 back of the tongues 5, thus locking or wedging tightly saidlips with said tongues, and consequently connecting the 'carrier and matrix firmly together and adapting the latter to be manipulatedby the former. lt is evident as the catches `are somewhat resilient they, may be ydiav/'n out laterally from the arms 7, whereby the lips 13 emerge from the slots9 when the tongues 5y are no longer controlled by said lips, and

thus the matrix may be readily discon.

nected from the carrier 6 Aand vice versa. The catchesare provided with lrnobs 14 for evident purposes.

ln Figs. 6 and 7 l show forms vofcarriers dilierent'from each other, and the one shown in the previous ligures. In Fig. .6 l shov.7 the terminals of the arms 7 continued into the bow 135 in' the crown of'which is fitted the screw 16, the inner end of which is pivotally connected with the toggle levers 17 by which provision the arms 7 maybe separated or brought toward eachother, and the width of the matrix accordingly adjusted. @n the outer endet the rod 16, the same being threaded, is fitted the nut 18 which is adapted to bear against the crown oi' the bow 15, its object being to move the rod 16 in opposite directions, and thusl open or close the toggle levers 17, as the case may be.

In Fig. 7 the saine result is produced by 7 and consequentlyV of the matrix will be effected by means of the spring 24: which is interposed between the inner ends vof the levers 19 and connected therewith. As the cavities of the teeth are multiform different styles of tooth filling matrix forms will be constructed, and all will be adapted to be engaged to the carrier.

The operation is as follows The cavity is properly prepared for the filling or inlay. The matrix is now fitted to the carrier, and

being held by it is placed around the tooth forming the lost wall and cusp of the cavity that is to receive the filling or inlay. The wax or filling rmaterial is placed in the cavity of the tooth and compressed by a suitable instrument against the wallsl of said cavity and the matrix. The tip 4 of the matrix is now pressed down over the surface of the tooth and burnished to th proper form.

The matrix material for plastic fillings lor wax inlays is usually made from thin metal, or Celluloid, and it can be held readily or controlled-by the operator in molding the filling or by the use of the carrier, Fig. l.

In the various operations a longer time may be necessary for the filling to set. In which operations the constructions shown in Figs. 6 and 7, while alsoV acting ascarriers have the advantage of engaging the matrix with the tooth sorasto tighten the matrix to conform to the outer walls of the cavity in the tooth beyond the margin and against the buccal and lingual faces thereof, and be held firmly by such engagement with the tooth so as to draw the Vmatrix tightly against the tooth conforming the filling or wax inlay to thecontour of the walls of the tooth, the matrix forming the missing wall of the cavity, which matrix when removed leaves a watertight margin of the filling or wax inlay, with the walls of the cavity and a smooth outer surface. I-Ieretofore, matrix bands have been made with apertures Vin which the retainer engages, in this toothfilling impression device the metal or celluloid projection of the matrix engages with the carrier and is held rigidly and firmly by the latter by its interlocking with the arms of the same.

As shown in Fig.. 8, the matrix may be reversed so that the front arms and sides of the `matrix are curved within the arms of the carrier as will be necessary when the inlays andplastic fillings are to be inserted in an anterior proximal cavity. The matrix vmay be made with or without the extension L that forms the cusp or lost grinding face of the tooth according to the nature of the operation.

In Fig. 9 I show one of the side arms as adapted to slide on the adjacent portion of the carrier, it having at its rear end a boss or flange which freely embraces said portion, and at the front end a lip which is adapted to enter the slot of the carrier and engage the adjacent portion'of the matrix, as inthe previous instances.

Having thus described my invention what I claim as new and desire to secure by Letters Patent, is Y Y 1. A carrier for a matrix band composed ofV an arm, la movable catch on said arm, said arm having an opening therein to receive a terminal member of said band, said catch having a forward terminal member adapted to enter said opening andk wedge tightly said terminal memberY of said matrix band. f

2. A matrix band having on a terminal thereof a laterally .projecting tongue, an arm adapted to carry said band and having an opening in theforward endthereof to receive said terminal tongue of the matrix band, and a movable catchL mounted on said arm having on its forward .end a llip which is adapted to enter ksaid opening and hold tightly the terminal tongue of the matrix band lon said arm. Y Y

3. A matrix band having on its side'a laterally-extending tongue, a carrier for said band having on its forward end an opening adapted to receive said tongue, Va resilient catch on said armhaving a longitudinally adjustable connection therewith, the forward portion ofsaid catch being adapted to engage said tongue of the band and wedge the same tightly on said carrier.

JAMES W. IVORY. Witnesses: y

JOHN A. WIEDERSHEIM, N. BUssINGER.

l Gopies of this patent may be' obtained for ve cents each, by addressing' the Commissioner of Patents,

Washington, 11C." i 

